Sheet-glass-drawing apparatus



BEST AVAILABLE COP\ Aug. 31,1926. 1,598,073

E, T. FERNGREN SHEET GLASS DRAWING APPARATUS Filed 061;. 11. 1924 3' Speets-Sheet 1 INVENTUR- Tic- Z- I a zg- ATTORNEY BEST AVAILABLE com Aug. 31, 1926. 1,598,073

7 v E. T. FERNGREN SHEET'GLASS DRAWING APPARATUS Filed Oct. 1L, 1924 3 Sheet-Sheet 2 as w Q ATT RNEY.

INVENT UR Aug. 31 1926.

BEST AVAILABLE COP:

E. T. FERNGREN' SHEET GLASS DRAWING APPARATUS Filed oct. 11, 1924 3 Sheets-Sheet 5 INVE NT D E; Enoch T I-Erngmn wvkww AT T U RNEY.

BEST AVAlLABLE COP\ Patented A g- 1926' name w A isaaen ENOCH T. FERNGREN, orzmomano, 0am, Assis -ion as IiIBBEYTCWENS mm GLASS oomranY, or rompo, onto, nfoonr'ona'rion or oEIo.

" snnn'r-enassfnnawine ,airAnA'rus'.

. tpplicationlfikd ll iae. serial na'i 7425951" glass 'wil'lj not .be ad v'aneedinto theline of draw atthe'se localities, thus making; it possible to produce'iai wide anduniform sheet o course ,of the following descripti'onif 'Iirthe dfrawing's wherein-like numerals are employed 'to'designate' 'likel parts 'throiighout flthefsame; v p p i Egg. "1 1s frag nent'ary, transverse section offa dlamhg lllafihllie SliOWlIlg my in of glass isdrawn upwardly from a bath oi iveiitioningu b" molten glass andthen while still ina semiplastic condition,'=a'lthough substantiallys'et-" i in its final sheetform, is 'bent 'into liori zontal plane and carried off through a suit-"* able drawingmechanism andinto a leer. Asf'a is well-known in the art. some means must be provided to maintain the Width oftl ie sheet drawn, otherwise it will gradually'nari row away until no 'sheetpis'lefh' The prior art structures make use of so-called knurled" rollers which are usually'positioned in"the ff' v meniscus at itsopposite ends, by whichlthe rolly 4 5 sheet is prevented from'narrowing accord" ing to its normal tendency. Theselrnurled' rollers have'however made it necessary to" cut off a substantial width of sheet section from the finished sheet due to the fact that the combined action of the rollers and the= supplemental air cooling normally employed, causes athickened portion to extend inward on the sheet a substantial distance from the edge so that it is necessary to remove this thickened port-ion before obtaining net width of the desired thickness pf sheet.

An important objectof this'inventionfis" to provide an improved type of'r'oller for use in connection with sheet glass drawingapparatus which is'adapted'to maintain the width of the sheet desired, while at the j same time it will cut down to a considerable extent the amount of glass that has heretofore been removed, as above pointed out.

Still another object of the invention is to provide a glass contacting roller of this n a' time that will produce or make it possible to produce a somewhat flatter and smoother sheet than has heretofore been done.

Another object of the invention is to pro vide rollers of such shape that they will partly restrict the amount of glass permitted to enter into the sheet immediately adjacent to its edges so that an excessive amount of showingthefposition of the rollsatone edge OffhSliQfi when in use.

F ig. 4= is an" end view of F igh2.

Figffiii's a'iplanfview-of'a slightly modifiedfform of roll mounting.

and advantagesbf the in-f Vention- 'will become apparent during the 2 1s"a"plaii ofthe'roll mounting. F g."'-'3 is' a fragmentary enlarged view {Fig 'G-is'a section taken on line 66 of -Fig '5, lookihgfin the direction of the ar- 'rows'.

F gs? sno si a ,slightly 'modifie'd form of Fig. 8 is a lon gitudiiial section Ofthe 1-011.

Fi'gl'tl is a longitudinal section showing a slight 'm'odificatiori of the interior thereof.

In the present practice of creating tension along the pedgeso'f the sheet with 'knurled"rolle'rs to thereby hold the sheet to wiclth."conditions are'cre'atedf which result in a thick edgearea ofiexce ssive width on the 'sheetja'djac ent the-knurled edge.

In accordance with the present invention, knurled rol'lersare provided that will prevent formation ofsuperfluous surface layer glass at themenis'cus, so that but little more 'in'wid'th of "surface glassis drawn into the sheet than will be the width of the sheet.

booking at the drawings, the numeral 10 designates a draw-pot in which is disposed a bath of molten glass 11. The pot 10 rests upon suitable supports and is heated from the bottom by means of burners or the like, which apparatus is not shown in the drawings, 'The sheet 12 is drawn from the pot lO 'and is trained over a bending roll 18, then overthe drawing table and leer until the sheet has been satisfactorily completed.

In the absence of suitable width maintainers'the sheet does not keep a desired width, so to 'prevent this narrowing up knurled rollersfl t are placed on both sides of the glass and at opposite edges thereof and BEST AVAILABLE com p b y. nthe meniscustli, Thev rled in the .ring so.... as to preventseparation of rollers 1 1 comprise {asubstantially; cylirrthe parts; g-

" 7 drical knurled body portion 16 and a re When it is desired to make adjustment the duced end 17 as is clearly shown in Fig. set screws 31 are operated so that the sup- 3. The reduced end 17 is prefrably-smooth--"port-32 upon whioh' the'-ti1bes--19*are mount and can be any-of' 'desii'ed curvature-such-- ed-may'-be moved'in theslideway 33 mountas disclosed in Figs. 3 and 7. It will, be ed ,on the rail131.4 If it is desired the ring seen that the knurled rollers have substan- 26 may be locked against rotation by tially a torpedo-shaped formation The tightening up..'t he set-screw 35 which is body portion 16 has the knurls thereon arpassed through the support 32. Any suitranged preferably in threaddika formationable i form, of .pQW-er. can be coupled. to the 18', tlie .,threads', b-eing dispos'ed'so, that therdriv e-shaft'36 torotateitheuknurls... a naturalltendencyqofthe, glass: dur ng the; .Rreferabbe the knurled;rollers; ane-moss. drawing operation will be" to be fed outtatediata rateioflspeed slower thaI-rthedravs ;v

-- -,wardly :fromtthespotato neutralizeigr ovenofpthesheet 1-2; fromithe pot-10. 'lh -r gn.

come the. normal,tendency of itlieg.sheet;to for this variance in speed is' due to-th'e fact narrow inwandlyi 1 a, Q; thatitiis idesflragblertoibuild alp a; thicker and Th knurled rollers 1e, are ,:-carried up' qrnpamtiygelypooler, edge {sotthat-the 1 edge onsuitable tubes 19. which.arescrew thread catn sustain thenweightpt-the gsheet-and wil l .ed or otherwise associated 'with the ,knurl preyent narrowing ,,up of thewsheet whent -v as indicated in. Fi 8. l heiknurlsare pr igoing: thnough theerest of the-machin which may be of any desired depth,

p as dtsei a tQg pliaQ- nd the upperi epe e 21. are vkeyed nea wthe oprs itafen s 0 tubes 9 n a h it a hz fl qt &5 e ofiiendt dieq ntthe siderportiomofiathe sho n ini g-LQ Ql e eyohmou ti ggthezmolten glassm thedifaiwrpQt.:j-xLlflgthB'tdI'tlW-. tubes is to have one tube fixdifinfd thehothen ingggof; glass frqmg a supply contained ima tube mounted ,uponaapivot or,v the like, P015 iii-is thflypresumlbaifingnhah tlle;:surffice,.

so that the piiioted tube canrniqve; toand glass,37 -and,-38 disposed ombotbsidesmfithe from the stationary. tube. A spring 2gisgareameniscus is dnawnup;-,andaionms the-nuten ranged between.vtlre outer ends of thie tube surfane.laor;,-thetwel sidesota-lthe sheet, 1242 pp t Q-fisi qi'm l y rge t'llfiilsmlrled'flVith the-mew piiknmledi tonpedo/rol-lr i-i rollers toward each other. 01 course tllertfers the kmuflied,.lw lfiimi18i';gnip;-the-.edges spring. will; a be sufiicie ntly r weakorrs resilient of bhe sheetusufli eiently-gtor retard the, draw a to permit the drawing of glass betweenthehstheigofi whilmfthe-grednoed, ends or d low knurled rollers..asqindicatedi.infig; 3. In ends,1'Z-;tapel?ofl-;the ends 39fiofi-the mensicusa order to,.keep -theknurled.rollers fro m over nextmothetgnippedsedgeiglass andthus prewz heating, pipes 23 are ruin through :the tubes vent the fenmationr-ot excessiyeisuriaoe while 19 and extend into-.the.bore. ,20-ti.n Suehsa gradually-;1:edueing the,quantityndya c f manner that the: coolingqmediummay be ;atlie end glaswogtgthe:'\meniscus;between: thewintroduced within the bone 20 through. the! iendsa 1210f the: (roller. ,Imother 5 worlds; the 1 pipes .23 .and. al1owed,to..pass=,ouuthrouginsuntaceiamai 0nibqfihze ed fiil ofgtlremeniscus; the.tube 19.i iVith'thisform oticonstruotinn; :is red-lieedhbefQreenteringintorthe(sides-oft a continuous flow.ofcooling medium,zoanbe 1the sheet .and thermeniscus-gbody 39izis ta-i passed through-;theknurled-rollerssoithat pered while; at the same timenmade more a:

an ev m ,and, constan per urewam bem acizi e; byi-theeends:ilt-totqthe knurled roll maintaineders, thus makingisitnpnssible-tor produce a In Fig.- 5 the-knurled rollers 14 are sup greaterzgemountmf asheetp Width sustaining ported on thetubes l9,-wh-i ch-rare driven"tension al0ng each-edge-,ofithe-sheetofghssu 5 simultaneously as throughtthe gears-21a :A F \1ntherm0re,,,it. SqtOfrbQ borne inumind that; 1*.

beveledmgear. 2 1' isv carried by one o-finthe the-forw-and pointi.lio-f the knurls'whiioh, tubes while a drive pinion-,25'is1 immeshr contacts. with-thensuriace.glassproducesa; therewith torotate both. o-fithe tubesesimuit-- .chil-lingeffeet-so that-arelativelyl heavy bead taneouglyiand' in opposite,directions In-edgeais built upuinsideeofhtheknurled1edge:

the oonstructionshowm inuF'igsi 5and,,6;lthe whichtfltcilitates theumaintenaaice ofi =sufii-i tubes 19 are mounted upon common centen:-.- cient heat. inwthewmamginal 'sectioni -of-fthe so that tl1ey-wi1lmove togethen. when inmsheet. Thisbeadbuilding action can becon operation. Look-ing at. Figt-fiwe see thatr! trolled-toiagreatt-extent lay/the :amount of 1 one of the tubes .19'-is \connecteduto flaring-e actuaili contactrof endslT-with the-.gLass-.and-- 26 in: which is received: the stulzirshast't 2'?!V by the depth: Qfi the .bore- -20nin the knurls.-.;1

carried by the: iotheri 05% said tubes, and ro- .1 If it is .foundv unden certain. conditions that tatably disposedwithin said ring. A eenten thercooling-eetion is- 'too great, a-bush'ing 40 1 post 28 ,is' passed -up through thewbottommf is vplaced-= in -tine borewhich"is-preferably the stubshait272and carries=a(disc=29 which@donmedq-fnomirar non conduotingl materials-so, is receivedim 1a -.sui-table;gro0ye 3.0 formed-'thatitheiheat-ahsorbing action: wilhnot ex- &5385973;

nd an un tion s rapidly-illness th ire. t pe ed end .Qf-t e 79 6 Bath r 70- vision'of tapered rollers, ,t he operation. is

will be increased i Va t a wl rst d 11151: je g rmbf BEST AVAlLPiBLE cor ;,engaging,rolls for-maintaining the desired width ofsheet, eachof saidrolls having a vknurled cylindrical body portion and a smooth reduced end. 1

7., In'combination with aIcontainer for drawing a sheet .of glasstherefrom, of edge the invention herewith; shown and deseribedr, Wid h pf eet, e h -S ol -having a is: to be taken. .as the preferred embodiment;

of the same,- and that yarious chailges in; the shape, size and arrangementpf parts-may be resorted to without departing. from the," pi i at t in ee ien nt i cen {of he hioimieliiii fiQ Alf 11. l r" L El .l- .1 the a t. .d a s; heet-slassat method of producing. ;a, flat sheet consisting in drawing 3 the sheet from, a surface, cooled cally restraine upp y, f. mo ten; gl s} itl ei tl res i t e cept adjacent the border portions of the sheet Where the dreua B t api -ihez' sr p yi g sere ed e f it re ;i'.-it th e hi n esswhil bein e hant fr m a van me t i e line of lI'ZlWfdi, W1. W

2. In thcuajrt of; drawngsheet glass, the method of controllingf the glass movement to the .bordenportions,.Df ,the sheet; being drawn, consisting in giving the opposite end:

portions I of; the-sheet r' supp lyqing meniscus body of glass which 15 being raised along the line of application of the drawing force,

such clearance space for movement in the direction of draw between sultable gripping means, that the number of square inches of surface glass at the end portions of the mensicus body of glass which are free to move in response to the tractive force will be gradually limited and reduced adjacent each sheet edge supplying end of the said meniscus body.

In combination with a container for molten glass and means for continuously drawing a sheet of glass therefrom, of rolls in contact with both sides of opposite edges of the sheet as it is drawn, each of said rolls having a knurled portion and a tapered smooth portion.

4. In combination with a container for molten glass and means for continuously drawing a sheet of glass therefrom, of rolls in contact with both sides of opposite edges of the sheet as it is drawn, said rolls being substantially torpedo-shaped.

5. In combination with a container for molten glass and means for continuously drawing a sheet of glass therefrom, of rolls in contact with both sides of opposite edges of the sheet as it is drawn, said rolls being substantially torpedo-shaped andhaving a knurled portion thereon.

6. In combination with a container for molten glass and aneans for continuously (lrawinga sheet of glass therefrom, of edge ,hnurled .-,cylindrioal" body portion and a molten glassgand. means for continuously,

engagingrolls formainta'ining the desired smooth reduced end, and means to internally cool the said rolls.

molten glass means; for continuously dra wmg ajs heet therefrom, of, means for mounted onthe end 'of each tube mr, 1

9.; In combination with a container 5 stantiallyjtorped shaped glassengagingroll ,8. In combination ivith a'container for v maintaining thedesired width of sheet.com-. prising. a support, a slide, on the support, a. pair ,of tubes carried by the slide, and a'sub-.v

m oilteri glassiland snieans for continuously d awi i=1 e eetatheretwma t e n r I maintaining the. desired width of sheet com ...P 1 as rea ion t e pp pair. of tubes .carried, @bythe slide, a substantially.ftorpedorshaped, glass engaging 1 roll mounted on the end of each tube, means to internally cool, the rolls,'- and :means to rotate the v same at any -desiredspeed.'.

1Q. In-Combination with a container for molten glassand means for continuously drawing a sheet of glass therefrom, of means for maintaining the desired width of sheet comprising a pair of rotatable shafts pivotally mounted upon the same center, substantially torpedo-shaped glass engaging rolls carried by the said shafts, and means to cool the said rolls.

11. A roll for use in sheet drawing apparatus, comprising a cylindrical body portion having knurling'thereon arranged in helical formation, and a smooth gradually reduced end.

12. A roll for use in sheet drawing apparatus, comprising a cylindrical body portion having knurling thereon arranged in helical formation, and a smooth gradually reduced end, said roll having a longitudinal recess therein for the reception of a cooling medium.

13. In sheet glass apparatus, means for containing a mass of molten glass, means for drawing a sheet therefrom, and rotatable means at the edges of the sheet, the clearance space therebetween being such that the quantity of glass free to move in the general tractive advance will be reduced progressively toward the edge of said sheet.

14. In sheet glass apparatus, means for containing a mass of molten glass, means for drawing a sheet therefrom, rotatable means at the edges of the sheet, the clearance space therebetween being such that the quantity of glass free to move in the general tracti-ve adjahoe wilhbe tediiceapiiy gressively toward= the edge; of said-{sheet and meansfdprotztting said means:

containing 'a 'mass of f molten glass; means for drawing a sheet-therefrom,

portions of the sheetbei'ng dieWvn,--s9iidmeans permitting mbre glass to-f-petss' there'- between attheir inner ends thmifiat"their outer-ends.-

16. In sheet glass containing a mass of-"mo1tng1ass,-' means for drawing a sheet therefrom; a pai'ir ofro-K' tatable means "arranged a t the ootdi poi tions of the sheet being drawn; I said ineitns permitting "more glass .-t 0 pas's 'therebetwen at their inner ends' thanattheir outeeendsg, and means for; "positively dti'iii i'gf said To 17. In sheet glgiss apparatiisf 'ndeans foi' from their inner ends toward their-"outer" ends. 7 I

18."Ih-'s'heet gl'ass apparatus, mea'nsfo'f containing ja massof molte'mglass; means for drawing a'sheet thereffi m}it of 176- apparatiis means? for BEST AVAILABLE COPE glass w "pass theijbfiWBii pi"o'gressively from their ir'itier ehils toward 5 theii'l outer pesitively dfi'vi'ng said= I end-impair; rotatableifieahsfl of rotatable means arranged at the border ends, me l-news 2150i 19. In sheet glass apparatus, means for eontainifig zit rriass oi hiolten'ghiss'y means 10 3 st-i-aintexc'pt a t "the' qootder- -portions; and

,' for drawing a sheet 'thewejffom Wit-hout re glims's-at the bbrir peftiori's to th'edesiTed edge thickness? containing a mass of molten' 'glassg means- *for drawing a sheet the .efrom withdutrestmi'ntexee t ae thebor er portions; and' a glass it the edge edge Ithiek mass;

supply glass at, the border -portions"ofthe sheet to -the dsiiedis'heet edge thickness.-

Signed-"titToldg -in' the ooiinty of Lucas ENQGETPFERNGREN 

